Bug 12905: funds with children could not be deleted

Bug 12905: funds with children could not be deleted

The interface should prevent to delete funds with children.
Otherwise the relationship is broken and problems occur:
1/ You don't see the orphan fund in the fund list
2/ You cannot edit the orphan fund amount ('Fund amount exceeds parent
allocation').

This patch:
- adds a JS check, template side
- adds a check in the perl script (should never be true)
- adds an updatedatabase check, in order to alert users with inconsistent data.

Test plan:
Verify you are not allow to delete a fund with children.

Signed-off-by: Paola Rossi <paola.rossi@cineca.it>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>